11 documents found, page 1 of 2
Comparative analysis of current deep learning networks for breast lesion segmen...
Ferreira, Margarida R.; Torres, Helena R.; Oliveira, Bruno; Fonseca, João Luís Gomes; Morais, Pedro André Gonçalves; Novais, Paulo; Vilaca, Joao L.Automatic lesion segmentation in breast ultrasound (BUS) images aids in the diagnosis of breast cancer, the most common type of cancer in women. Accurate lesion segmentation in ultrasound images is a challenging task due to speckle noise, artifacts, shadows, and lesion variability in size and shape. Recently, convolutional neural networks have demonstrated impressive results in medical image segmentation tasks....
Kidney segmentation in three-dimensional ultrasound images using a fast phase-b...
Torres, Helena R.; Queirós, Sandro Filipe Monteiro; Morais, Pedro André Gonçalves; Oliveira, Bruno; Fonseca, João Luís Gomes; Mota, PauloRenal ultrasound imaging is the primary imaging modality for the assessment of the kidney’s condition and is essential for diagnosis, treatment and surgical intervention planning, and follow-up. In this regard, kidney delineation in three-dimensional ultrasound images represents a relevant and challenging task in clinical practice. In this paper, a novel framework is proposed to accurately segment the kidney in...
Technical note: assessment of electromagnetic tracking systems in a surgical en...
Fonseca, João Luís Gomes; Veloso, Fernando; Queirós, Sandro Filipe Monteiro; Morais, Pedro André Gonçalves; Pinho, António C. M.; Fonseca, Jaime C.Purpose Electromagnetic tracking systems (EMTSs) have been proposed to assist the percutaneous renal access (PRA) during minimally invasive interventions to the renal system. However, the influence of other surgical instruments widely used during PRA (like ureteroscopy and ultrasound equipment) in the EMTS performance is not completely known. This work performs this assessment for two EMTSs [Aurora (R) Planar F...
Patient-specific outcome simulation after surgical correction of Pectus Excavat...
Couto, Mafalda Araújo Seara; Fonseca, João Luís Gomes; Moreira, António Herculano Jesus; Henriques-Coelho, Tiago; Fonseca, Jaime C.Although minimally invasive Nuss procedure is frequently performed to correct Pectus Excavatum, the successful aesthetical outcome is not always ensured. Using the computed tomography (CT) data of six patients, high-quality surfaces of the anterior chest wall were generated, alongside with a personalized corrective-bar. Through finite element method (FEM), replicating the surgical procedure, a simulation of the...
Personalized dynamic phantom of the right and left ventricles based on patient-...
Fonseca, João Luís Gomes; Morais, Pedro André Gonçalves; Queirós, Sandro Filipe Monteiro; Veloso, Fernando; Pinho, Antonio C. M.; Fonseca, Jaime C.Dynamic phantoms of the heart are becoming a reality, with their use spread across both medical and research fields. Their purpose is to mimic the cardiac anatomy, as well as its motion. This work aims to create a dynamic, ultrasound-compatible, realistic and flexible phantom of the left and right ventricles, with application in the diagnosis, planning, treatment and training in the cardiovascular field for stu...
A dual-modal CT/US kidney phantom model for image-guided percutaneous renal access
Fonseca, João Luís Gomes; Miranda, Alice Augusta Macedo; Morais, Pedro; Queirós, Sandro Filipe Monteiro; Pinho, A. C. Marques; Fonseca, Jaime C.Percutaneous renal access (PRA) is a crucial step in some minimally invasive kidney interventions. During this step, the surgeon inserts a needle through the skin until the kidney target site using fluoroscopy and ultrasound imaging. Recently, new concepts of enhanced image-guided interventions have been introduced in these interventions. However, their validation remains a challenging task. Phantom models have...
A novel multi-atlas strategy with dense deformation field reconstruction for ab...
Oliveira, Bruno; Queirós, Sandro Filipe Monteiro; Morais, Pedro André Gonçalves; Torres, Helena Daniela Ribeiro; Fonseca, João Luís Gomes"Available online 2 February 2018"; Anatomical evaluation of multiple abdominal and thoracic organs is generally performed with computed tomography images. Owing to the large field-of-view of these images, automatic segmentation strategies are typically required, facilitating the clinical evaluation. Multi-atlas segmentation (MAS) strategies have been widely used with this process, requiring multiple alignments...
A new methodology for assessment of pectus excavatum correction after bar remov...
Fonseca, João Luís Gomes; Vilaça, João Luis Araújo Martins; Henriques-Coelho, Tiago; Direito-Santos, Bruno; Pinho, António C.M.; Fonseca, Jaime C.Purpose: The objective is to present a new methodology to assess quantitatively the impact of bar removal on the anterior chest wall, among patients with pectus excavatum who have undergone the Nuss procedure, and present a preliminary study using this methodology. Methods: We propose to acquire, for each patient, the surface of the anterior chest wall using a three-dimensional laser scanner at subsequent time ...
Assessment of 3D scanners for modeling Pectus Carinatum corrective bar
Moreira, António Herculano Jesus; Fonseca, João Luís Gomes; Rodrigues, Pedro Miguel Loureiro; Fonseca, Jaime C.; Pinho, A. C. MarquesPectus Carinatum (PC) is a chest deformity consisting on the anterior protrusion of the sternum and adjacent costal cartilages. Non-operative corrections, such as the orthotic compression brace, require previous information of the patient chest surface, to improve the overall brace fit. This paper focuses on the validation of the Kinect scanner for the modelling of an orthotic compression brace for the correcti...
Automatic modeling of an orthotic bracing for nonoperative correction of Pectus...
Vilaça, João L.; Rodrigues, Pedro Miguel Loureiro; Moreira, António Herculano Jesus; Fonseca, João Luís Gomes; Pinho, A. C. Marques; Fonseca, Jaime C.Pectus Carinatum is a deformity of the chest wall, characterized by an anterior protrusion of the sternum, often corrected surgically due to cosmetic motivation. This work presents an alternative approach to the current open surgery option, proposing a novel technique based on a personalized orthosis. Two different processes for the orthosis' personalization are presented. One based on a 3D laser scan of the pa...